Quantum Coherent Tunable Coupling of Superconducting Qubits

Antti Niskanen, K. Harrabi, F. Yoshihara, Y. Nakamura, S. Lloyd, J.S. Tsai

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Abstract

To do large-scale quantum information processing, it is necessary to control the interactions between individual qubits while retaining quantum coherence. To this end, superconducting circuits allow for a high degree of flexibility. We report on the time-domain tunable coupling of optimally biased superconducting flux qubits. By modulating the nonlinear inductance of an additional coupling element, we parametrically induced a two-qubit transition that was otherwise forbidden. We observed an on/off coupling ratio of 19 and were able to demonstrate a simple quantum protocol.
Original languageEnglish
Pages (from-to)723-726
JournalScience
Volume316
Issue number5825
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

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Niskanen, A., Harrabi, K., Yoshihara, F., Nakamura, Y., Lloyd, S., & Tsai, J. S. (2007). Quantum Coherent Tunable Coupling of Superconducting Qubits. Science, 316(5825), 723-726. https://doi.org/10.1126/science.1141324